Results 51 - 57 of 57

• Safety Analysis of Surface Haulage Accidents
  1/1/1996 - Conference papers
  Report on research analyzing single and multiple causes of surface haulage accidents.
• Modeling and Data Analysis of 50 to 5000 kHz Radio Wave Propagation in Coal Mines
  2/1/1990 - Contract reports
  This supplement to the final report is a collection of interim and monthly reports and working memoranda prepared during the course of this program to document the progress, methods and results of the work.
• Method Factors for Anemometer Measurement at Pipe Outlets
  1/1/1987 - Reports of Investigations
  Gob holes are routinely used by the mining industry to vent methane from gobs and to prevent it from entering the mine ventilation system. In some cases, flows from gob holes are measured by centering an anemometer on the end of a discharge pipe. These ...
• Evaluation of the Black River Mine Telecommunication System
  2/1/1982 - Contract reports
  An evaluation was made of one of several improved underground communication systems sponsored by the U.S. Bureau of Mines. The system was installed in a typical metal-nonmetal, room-and-pillar mine and utilized ultrahigh frequency repeaters connected to...
• Data Security for In-Mine Transmission: Final Report - Part I
  2/1/1981 - Contract reports, Open File Reports
  A survey of electromagnetic noise reports was performed and a summary of the results are given.
• Use of Surface Joint and Photolinear Data for Predicting Subsurface Coal Cleat Orientation
  1/1/1976 - Reports of Investigations
  Coalbeds exhibit a directional permeability, with the maximum permeability oriented parallel to the face cleat. Thus, the most efficient pattern of vertical degasification holes for a coalbed is dependent upon cleat orientation. Analysis of surface joi...
• Methane Diffusion Parameters for Sized Coal Particles: A Measuring Apparatus and Some Preliminary Results
  1/1/1972 - Reports of Investigations
  A sorption apparatus for measuring the equilibrium sorption isotherm and the rate of diffusion of methane from fine-sized coal was designed and constructed. Preliminary work that used Pittsburgh and Pocahontas No. 3 Coal shows that the diffusion coeffic...